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平均偏差

平均偏差
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2016-08-27 03:00
数列概率统计
本范例演示平均偏差的概念。用户可以通过拖动数据点来改变平均偏差值。同时，还可以观察到标准偏差的变化。通过使用GeoGebra中的Point, RotateText, Intersect, Polygon, Length, Sequence, Segment, SD等命令，可以直观地理解统计学中的重要概念。适合高中数学教学和学习。

GeoGebra 命令及参数

  1. Point(x = 1) → D_1
  2. RotateText(text2, 90°) → ytitle
  3. Point(xAxis) → A
  4. Intersect(xAxis, yAxis) → B
  5. Point(yAxis) → C
  6. Point(x = 2) → D_2
  7. Point(x = 3) → D_3
  8. Point(x = 4) → D_4
  9. Point(x = 5) → D_5
  10. Point(x = 6) → D_6
  11. Point(x = 7) → D_7
  12. Point(x = 8) → D_8
  13. Polygon(A, B, C, D) → poly1, a, b, c, d
  14. Length(data) → len
  15. Sequence(y(data(i)), i, 1, len) → yvals
  16. Sequence(x(data(i)), i, 1, len) → xvals
  17. Sequence(Segment[data(i), (xvals(i), avmeas)], i, 1, len) → avdevlines
  18. Sequence(abs(yvals(i) - avmeas), i, 1, len) → avdevs
  19. Segment((0, avmeas), (100, avmeas)) → avline
  20. Polygon(E, F, G, H) → poly2, e, f, g, h
  21. SD(yvals) → stddev
  22. Segment((len + 3, avmeas + 0.1), (len + 3, avmeas + 0.1 + avdeviation)) → avdevline
  23. Segment((len + 3.3, avmeas + 0.1), (len + 3.3, avmeas + 0.1 + stddev)) → sdevline